/*eslint no-bitwise: 0, eqeqeq: 0, curly: 0, strict: 0, no-eq-null: 0, no-shadow: 0, no-undef: 0 */
//		 uuid.js
//
//		 Copyright (c) 2010-2012 Robert Kieffer
//		 MIT License - http://opensource.org/licenses/mit-license.php
var uuid;
// Unique ID creation requires a high quality random # generator.	We feature
// detect to determine the best RNG source, normalizing to a function that
// returns 128-bits of randomness, since that's what's usually required
var _rng;

// Allow for MSIE11 msCrypto
var _crypto = window.crypto || window.msCrypto;

if (!_rng && _crypto && _crypto.getRandomValues) {
	// WHATWG crypto-based RNG - http://wiki.whatwg.org/wiki/Crypto
	//
	// Moderately fast, high quality
	var _rnds8 = new Uint8Array(16);
	_rng = function whatwgRNG() {
		_crypto.getRandomValues(_rnds8);
		return _rnds8;
	};
}

if (!_rng) {
	// Math.random()-based (RNG)
	//
	// If all else fails, use Math.random().	It's fast, but is of unspecified
	// quality.
	var _rnds = new Array(16);
	_rng = function() {
		for (var i = 0, r; i < 16; i++) {
			if ((i & 0x03) === 0) r = Math.random() * 0x100000000;
			_rnds[i] = (r >>> ((i & 0x03) << 3)) & 0xff;
		}

		return _rnds;
	};
}

// Buffer class to use
var BufferClass = typeof window.Buffer == 'function' ? window.Buffer : Array;

// Maps for number <-> hex string conversion
var _byteToHex = [];
var _hexToByte = {};
for (var i = 0; i < 256; i++) {
	_byteToHex[i] = (i + 0x100).toString(16).substr(1);
	_hexToByte[_byteToHex[i]] = i;
}

// **`parse()` - Parse a UUID into it's component bytes**
function parse(s, buf, offset) {
	var i = (buf && offset) || 0,
		ii = 0;

	buf = buf || [];
	s.toLowerCase().replace(/[0-9a-f]{2}/g, function(oct) {
		if (ii < 16) {
			// Don't overflow!
			buf[i + ii++] = _hexToByte[oct];
		}
	});

	// Zero out remaining bytes if string was short
	while (ii < 16) {
		buf[i + ii++] = 0;
	}

	return buf;
}

// **`unparse()` - Convert UUID byte array (ala parse()) into a string**
function unparse(buf, offset) {
	var i = offset || 0,
		bth = _byteToHex;
	return (
		bth[buf[i++]] +
		bth[buf[i++]] +
		bth[buf[i++]] +
		bth[buf[i++]] +
		'-' +
		bth[buf[i++]] +
		bth[buf[i++]] +
		'-' +
		bth[buf[i++]] +
		bth[buf[i++]] +
		'-' +
		bth[buf[i++]] +
		bth[buf[i++]] +
		'-' +
		bth[buf[i++]] +
		bth[buf[i++]] +
		bth[buf[i++]] +
		bth[buf[i++]] +
		bth[buf[i++]] +
		bth[buf[i++]]
	);
}

// **`v1()` - Generate time-based UUID**
//
// Inspired by https://github.com/LiosK/UUID.js
// and http://docs.python.org/library/uuid.html

// random #'s we need to init node and clockseq
var _seedBytes = _rng();

// Per 4.5, create and 48-bit node id, (47 random bits + multicast bit = 1)
var _nodeId = [
	_seedBytes[0] | 0x01,
	_seedBytes[1],
	_seedBytes[2],
	_seedBytes[3],
	_seedBytes[4],
	_seedBytes[5]
];

// Per 4.2.2, randomize (14 bit) clockseq
var _clockseq = ((_seedBytes[6] << 8) | _seedBytes[7]) & 0x3fff;

// Previous uuid creation time
var _lastMSecs = 0,
	_lastNSecs = 0;

// See https://github.com/broofa/node-uuid for API details
function v1(options, buf, offset) {
	var i = (buf && offset) || 0;
	var b = buf || [];

	options = options || {};

	var clockseq = options.clockseq != null ? options.clockseq : _clockseq;

	// UUID timestamps are 100 nano-second units since the Gregorian epoch,
	// (1582-10-15 00:00).	JSNumbers aren't precise enough for this, so
	// time is handled internally as 'msecs' (integer milliseconds) and 'nsecs'
	// (100-nanoseconds offset from msecs) since unix epoch, 1970-01-01 00:00.
	var msecs = options.msecs != null ? options.msecs : new Date().getTime();

	// Per 4.2.1.2, use count of uuid's generated during the current clock
	// cycle to simulate higher resolution clock
	var nsecs = options.nsecs != null ? options.nsecs : _lastNSecs + 1;

	// Time since last uuid creation (in msecs)
	var dt = msecs - _lastMSecs + (nsecs - _lastNSecs) / 10000;

	// Per 4.2.1.2, Bump clockseq on clock regression
	if (dt < 0 && options.clockseq == null) {
		clockseq = (clockseq + 1) & 0x3fff;
	}

	// Reset nsecs if clock regresses (new clockseq) or we've moved onto a new
	// time interval
	if ((dt < 0 || msecs > _lastMSecs) && options.nsecs == null) {
		nsecs = 0;
	}

	// Per 4.2.1.2 Throw error if too many uuids are requested
	if (nsecs >= 10000) {
		throw new Error("uuid.v1(): Can't create more than 10M uuids/sec");
	}

	_lastMSecs = msecs;
	_lastNSecs = nsecs;
	_clockseq = clockseq;

	// Per 4.1.4 - Convert from unix epoch to Gregorian epoch
	msecs += 12219292800000;

	// `time_low`
	var tl = ((msecs & 0xfffffff) * 10000 + nsecs) % 0x100000000;
	b[i++] = (tl >>> 24) & 0xff;
	b[i++] = (tl >>> 16) & 0xff;
	b[i++] = (tl >>> 8) & 0xff;
	b[i++] = tl & 0xff;

	// `time_mid`
	var tmh = ((msecs / 0x100000000) * 10000) & 0xfffffff;
	b[i++] = (tmh >>> 8) & 0xff;
	b[i++] = tmh & 0xff;

	// `time_high_and_version`
	b[i++] = ((tmh >>> 24) & 0xf) | 0x10; // include version
	b[i++] = (tmh >>> 16) & 0xff;

	// `clock_seq_hi_and_reserved` (Per 4.2.2 - include variant)
	b[i++] = (clockseq >>> 8) | 0x80;

	// `clock_seq_low`
	b[i++] = clockseq & 0xff;

	// `node`
	var node = options.node || _nodeId;
	for (var n = 0; n < 6; n++) {
		b[i + n] = node[n];
	}

	return buf ? buf : unparse(b);
}

// **`v4()` - Generate random UUID**

// See https://github.com/broofa/node-uuid for API details
function v4(options, buf, offset) {
	// Deprecated - 'format' argument, as supported in v1.2
	var i = (buf && offset) || 0;

	if (typeof options == 'string') {
		buf = options == 'binary' ? new BufferClass(16) : null;
		options = null;
	}
	options = options || {};

	var rnds = options.random || (options.rng || _rng)();

	// Per 4.4, set bits for version and `clock_seq_hi_and_reserved`
	rnds[6] = (rnds[6] & 0x0f) | 0x40;
	rnds[8] = (rnds[8] & 0x3f) | 0x80;

	// Copy bytes to buffer, if provided
	if (buf) {
		for (var ii = 0; ii < 16; ii++) {
			buf[i + ii] = rnds[ii];
		}
	}

	return buf || unparse(rnds);
}

// Export public API
uuid = v4;
uuid.v1 = v1;
uuid.v4 = v4;
uuid.parse = parse;
uuid.unparse = unparse;
uuid.BufferClass = BufferClass;

// assign a unique id to this axe instance
axe._uuid = v1();

export { v1, v4, parse, unparse, BufferClass };
export default v4;
